What exactly happens in the human body during a blood transfusion? How is the extra blood accommodated?
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Your blood vessels aren’t rigid. They stretch and contract with each heartbeat to allow blood to flow past, and your blood volume can (and does) vary over the course of the day based on things like how much water you’re drinking, salt intake, and other factors. (This is part of why high blood pressure is bad: it keeps the vessels stretched out in a way that makes them less elastic.)
Transfusions are also usually used in cases where you’ve *lost* blood, so your total blood volume isn’t actually higher than it previously was in most cases.
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